The US exports to Mexico as stated by the United States Trade representative:

Mexico was the United States’ 2nd largest goods export market in 2015.

U.S. goods exports to Mexico in 2015 were $236 billion, down 1.6% ($3.9 billion) from 2014 but up 97% from 2005. U.S. exports to Mexico are up 468% from 1993 (pre-NAFTA). U.S. exports to Mexico account for 15.7% of overall U.S. exports in 2015.

U.S. exports of services to Mexico were an estimated $30.8 billion in 2015, 2.7% ($807 million) more than 2014, and 36.7% greater than 2005 levels. It was up roughly 196% from 1993 (pre-NAFTA). Based on 2014, leading services exports from the U.S. to Mexico were in the travel, transportation, and intellectual property (computer software) sectors.

In addition, numerous US companies such as Ford, Chrysler, Procter& Gamble, CocaCola, Kimberly Clark, Walmart, Starbucks to name a few, have a business presence in Mexico that is not reflected in the net benefit of the US doing business with Mexico.